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IS-95B will display D because it is the CDMA Revision before 1xRTT became available, as such it will not be capable of 1X(RTT) data. EVDO is a separate data carrier, so it should still be available for use on the handset.

If you want to keep P_REV 4 forced, there really isn't a downside except really slow data and possibly no data (depending on the carrier you're on) if EVDO is not available.

It use to be that you could change between EVRC and 13K by just using the Voice_SO menu, but that is no longer the case.
With the enV Touch (and enV3) in P_Rev 6 mode, it shows 4GV on the test screen with 1X, and in P_Rev 4 mode it shows EVRC and D.
I made a few test calls with both, and can hear a slight difference between them. It sounds like 4GV is slightly more"digitized", almost like if you had an MP3 at a lower bit rate. EVRC was less digitized and more "human" sounding.
But neither one had muffled call quality, both were the same loudness.

Usually the towers decide what vocoder your phone uses so in many places, changing that setting has no effect anymore. In upstate NY, I am unable to go back to 13K, even if I set my phone to that vocoder. All calls will be made in EVRC-B. I haven't tried recently but I'm sure 4GV is what is being forced now.

Usually the towers decide what vocoder your phone uses so in many places, changing that setting has no effect anymore. In upstate NY, I am unable to go back to 13K, even if I set my phone to that vocoder. All calls will be made in EVRC-B. I haven't tried recently but I'm sure 4GV is what is being forced now.

I wonder if they are running half rate mode at times here. You can tell a bit of difference, when you hear ringing it's more warbled. Sprint is still using EVRC only. Weird. I wonder what codec will be used on LTE. Hopefully none of that GSM AMR-Half Rate crap.

Ok so there is no other downside except possibly losing data in some area's when forcing P_REV 4 Digital and EVRC or 13k? Voice quality is noticeably better, maybe they will add more capacity soon. Maybe a Network Extender would help too. I won't get in trouble by VZW either will I for forcing that?

The Network Expander does not hand off cleanly (it'll drop calls as you go out of range of the extender.) It's really more for filling in coverage holes. But, you know, I can't see why it wouldn't work.

No you won't get in trouble w/ Verizon. Perhaps someone in engineering looks at codec stats (per site, not per phone) for capacity planning and such, but Verizon, Sprint, AT&T, and T-Mobile all have phones where the codec can be changed and I've never heard of anyone hearing a peep over changing it.